Hardwicke's science-gossip : an illustrated medium of interchange and gossip for students and lovers of nature . d probably-sensory in function. On the hinder surface of the head, below theoccipital foramen, is the labium, which representsthe second pair of maxillae, fused together in theirbasal half, but retaining elsewhere sufficient resem-blance to the less-modified anterior pair to permit ofthe identification of its component parts. The palpis three-jointed, and carried upon a separate basal side, and two ventral. The peculiar shape of thelateral and ventral plates may be seen in fig. 63.
Hardwicke's science-gossip : an illustrated medium of interchange and gossip for students and lovers of nature . d probably-sensory in function. On the hinder surface of the head, below theoccipital foramen, is the labium, which representsthe second pair of maxillae, fused together in theirbasal half, but retaining elsewhere sufficient resem-blance to the less-modified anterior pair to permit ofthe identification of its component parts. The palpis three-jointed, and carried upon a separate basal side, and two ventral. The peculiar shape of thelateral and ventral plates may be seen in fig. 63. The elements of the thoracic exoskeleton aresimpler in the cockroach than in insects of powerfulflight, where adaptive changes greatly obscure theprimitive arrangement. There are three segments,each defended by a dorsal plate {tergum) and a ventralplate (sternu;n). The sterna are often divided intolateral halves. Of the three terga the first (pronotum\is the largest; it has a wide free edge on each side,projects forwards over the neck, and when the headis retracted, covers this also, its semi-circular fore-.
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Keywords: ., bookcentury1800, booksubjectnaturalhistory, booksubjectscience
